Locomotive-dynamometer.



LB. PHILLIPS & s. T. PARK.-

LOGOMOTIVE DYNAMOMETBR.

APPLICATION FILED 13120.23. 1907.

Patented Dec. 17, 1912.

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COLUMBIA PLANOGRAPH ca WASHINGTON. D. C.

J. E. PHILLIPS & S. T. PARK.

- LOGOMOTIVE DYNAMOMETER.

APPLICATION FILED DEG. 23. 1907.

1,047,696, Q Patented Dec. 17, 1912.

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To all whom it may concern Be it known that we, JOHN E. PHILLIPS.

LOCOMOTIVE nnconnnve DYNAMOMETER COMPANY, or CHICAGO, ILLINOIS, A 003- PQRATION F MAINE.

and SAMUEL T. PARK, citizens of the United States, both residing at Danville, in the county of Vermilion and State of Illinois, have invented certain new and useful Improvements in Locomotive-Dynamometers,

of which the following isaspecification.

Our lnvention is an improvement 1n locomotive dynamometers of the form n whlch thetractive force exerted by the locomotive is indicated and recorded by means of the pressure imposed upon a liquid, such as oil,

contained in a cylinder secured to the locomotive or tender and acted upon by a plun-I ger secured to one of the cars of thetrain.

In operating devices of this kind it has been found that a certain amount ofoil passes.

between the plunger packing and the walls of the cylinder, resulting not only in the loss of oil but also, whenthe leakage-has proceeded far enough, interfering with the proper action ofthe apparatus.

Theobject of our inventionis to restore the liquid which passes between the plunger packing..and the walls of the cylinder .to

operative position inside of the cylinder,

I andto keep the cylinder supplied with oil.

' Inthe drawings-Figure 1 is a view, partly in section, of the cab ofa locomotive and its tender, our nnproved device being;

shown thereon. Fig. 2 is a' fragmentary view of the pressure cylinder and connected parts. Fig. 3 is a sectional view on the line 3 of Fig. 2, and Fig. 4 is a longitudinal vertical section of the by-passfand valve for restoring the oil or other liquidto operative position inside of the cylinder, and for keepmotive or tender in such manner that the ting the cylinder supplied with oil. 40

the pressure cylinderl mounted upon the,

In the present instance we have shown referring to it as mounted upon the 'lomomotive, we intend toconvey the idea that it is mounted either directly upon the 1000 motive or upon its tender. The coacting part of the apparatus, namely,i the plunger 2, is mounted upon the draw-bar of the'locotractive force between the locomotive and 'LOCOMOTIVE-DYNAMOMETER.

Specification of Letters Patent.

Application filed December 23, 1907. Serial No. 407,721. q

Patented Dec.17, 1912.

the traintends'to cause the plunger to move mwardly in the open ended cylinder 1.

In the present instance the coupler 4 of I UNITED sr-ATEs PATENTOFFICE;

JOHN E. PHILLIPS AI ID SAMUEL T. PARK, 01 lDAiNVILLE, ILLINOIS, ASSIGNORS TO the locomotive is connected to a yoke consisting of bars 5 and cross members 6 and 7. I

The plunger 8 is secured to the cross 'member 6 by meansof the pin 9. The cylinder 1 is formed with an upwardly projecting part 10 adapted to rest against the end sill 11 of the car and to be secured by suitable means to the underframing of the car. The.

plunger 8 is formed, preferably, with an annular groove or depression 12, forming a space in which oil leaking past the. head'of' the plunger may be retained until drawn back to operative position-as hereinafter described. The cylinder is connected by means of pipe 18 with a suitable registering I. 4

device 14 in the cab of the locomotive. This registering device may either indicate or record the pressure upon the .oil contained in the cylinder 1, or itimay perform both of these functions.

It will be apparent that tractive force 1 acting through the coupler 14 will tend to plunger 8. About midway oft-heby-pass 15 we provide a one-way valve 18 coacting with a suitable seat 19 formed in the bypass.

In order to facilitate access to this valve we provide a screw threaded plug 20 provided on its lower sidewith a stop 21 adapted to limit the movement of the valve '18.

It will be apparent that when the oil contained'in the cylinder isunder compression, due mum trac'tive force exerted bythe locomotive, there will be no passage of oil through the by-pass, movement of oil in that direction being I prevented by, the one-way valve 18. Under bufiing strain, however,

the plunger 8 will move outwardly in. the

cylinder 1, thus forming'apartial vacuum; in the cylinder, which willhave' the eflect I of drawing through the by pass'in the "direction from l'i' to 16 any oil which may have escaped past the head of the plunger, 8,.

.movement "of, oil in thisdirection being permitted by the one-way valve 18. The bypass may be initially filled with oil from end to end, and any oil leaking past the plunger 8 will drain through the opening 17 into the bypass. In order to prevent any tendency for the forming of a partial vacuum behind the body of oil in the bypass, we provide a small groove 25 for the purpose of admitting air.

It will be obvious that the apparatus may be kept charged with oil through any oil reservoir connected with the inner end of the cylinder and provided with a one-way valve opening inwardly. We have found, however, that by connecting the outer end of the oil inlet to the cylinder at a point back of the plunger head we are enabled to save the oil which would otherwise be wasted through leakage between the plunger and cylinder wall.

We claim:

1. A locomotive dynamometer comprising a cylinder, a. plunger, pressure-registering means connected with said cylinder, a bypass communicating with said cylinder on opposite sides of said plunger, and a oneway valve in said by-pass.

2. A locomotive dynamometer comprising a cylinder connected to the locomotive, a plunger operating in said cylinder and connected to the train, the parts being so ar ranged that the tractive force exerted by the locomotive acts to compress liquid contained in the cylinder, a by-pass communicating with said cylinder at points on opposite sides of said plunger, and a one-way valve in said by-pass, said valve operating to prevent passage of liquid through said by-pass under pressure of said plunger, but permitting liquid to be drawn therethrough by the outward movement of said plunger.

3. A locomotive dynamometer comprising a cylinder, a plunger having a depression and operating under the tractive force of the locomotive to compress liquid contained in the cylinder, and means for automatically returning to operative position liquid which passes between the plunger and the walls of the cylinder, tosaid depression.

1. A loco-motive dynamometer comprising a cylinder, a plunger, pressure registering" means connected with said cylinder and 0perated by the pressure of the liquid therein, a liquid container communicating with said cylinder, and a oneway valve between said container and said cylinder, said valve opening toward said cylinder.

5. A locomotive dynamometer comprising a cylinder, a. plunger having a depression and operating under the tractive force of the locomotive acting in one direction to compress a liquid contained in the cylinder, and means by which said plunger may operate under the tractive force acting in another direction to move the liquid from said de pression to the operating side of said plunger.

6. A locomotive dynamometer comprising a cylinder, a plunger having a depression and operating under the tractive force of the locomotive to produce a pressure in a liquid in said cylinder, and means by which the tractive force may also cause said plunger to draw the liquid from said depression to the operating side of said plunger.

7 A locomotive dynamometer comprising a cylinder, a plunger having a depression and operating under the tractive force of the locomotive to produce a pressure in a liquid in said cylinder, means by which the tractive force may also cause said plunger to draw the liquid from said depression .to the operating side of said plunger, and pressureregistering means actuated by said liquid.

JOHN E. PHILLIPS. SAldUEL T. PARK.

Witnesses:

T. B. Cosenovn, M. F. KEEGAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents- Washingcon, D. G. 

